Heating and roasting furnace.



' Patented May 28, mm. A. W. JOHNSON.

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No. 675;28l. Patented May 28, I91.

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HEATING AND ROASTING FURNACE.

(Application med Sept. 1a, 1999.

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UNITED STATES PATENT OFFICE.

ARTHUR W. JOHNSON, OF TACOMA, WASHINGTON.

HEATING AND ROASTING FURNACE.

SPECIFICATION formingpart of Letters Patent No. 675,281, dated May 28,1901.

Application filed September 18, 1899. Serial No. 730,879. (No model.)

T on whom it may concern.-

Be it known that I, ARTHUR W. JOHNSON, a citizen of the United States,residing at Tacoma, in the county of Pierce and State of Washington,have invented certain new and useful Improvements in Heating andRoasting Furnaces,of which the followin gis aspecification.

My invention pertains to furnaces in which ores are heated and roasted.It has for its object the construction and protection of an adjustabletrack along the sides of the furnace-hearths on which the machinery maybe carried for stirring and shifting the ores, said construction beingadaptable to but independent of the construction of the furnace.

My invention consists of certain details of construction hereinafterdescribed and as illustrated in the accompanying drawings, in whichFigure I is a cross-section of aheating an roasting furnace with myinvention located therein. Fig. II represents a slightly -enlarged viewof the inner side of the metal rail-chair and shield which form a mainpart of my invention. Fig. III represents an outer view of the same.Fig. IV is an enlarged section of one side of a roasting-furnace with myinvention set in place as designed to be used. Fig. V is a partial sideexterior elevation of the furnace, showing the openings for theobservation-doors.

Similar letters refer to similar parts in the several views.

My invention comprises a continuous hood or overhanging shield A, madeof cast-iron or other suitable material and of a form to fit in thesides of the roasting-furnace, as shown in Figs. I and IV. It isconstructed in sections, as indicated in Figs. II and III, whose endsfit evenly together and are held in conformity with each other by meansof interlocking lugs B B. The overhanging shield is supported by acontinuous L-shaped upright and base 0 and D, respectively, all of whichis cast with the shield into one piece. The upright part is stiffened byweb-braces E E, and the overhanging shield is likewise braced by theweb-brace F, placed directly opposite to E.

furnace heat.

On the inner edge of the base D is cast a railchair G, which is designedto support a railroad-rail, and thus provide a track on which arabble-arm or device for stirring and shifting the heated ores may becarried. The

rail-chair is provided with bolt-slots H,

through which the rails L are securely bolted to the chair. A beveledwasher K, made to fit the flange of the rail, is put on each bolt beforethe nut is screwed down. The slotshaped bolt-holes are designed with aView to shifting the rail to the right or left, thus making a provisionfor adjusting the width of the track to fit any variation that may occurin the width of rabble-arm and also to fit any variation in the width ofthe furnace that is liable to be caused by the heat therein. An openingM is cast in the upright part C. These openings are designed to conformwith the openings for the observation-doors along the sides of thefurnace and give access to the rail-chairs, as shown at O in Fig. V.

My invention has the special advantage of being adaptable to any form offurnace for roasting ores. Its construction in no way enters into norinterferes with the construction of the furnace. It can be placed inposition and be removed or repaired in whole or in part withoutseriously damaging or removing any part of the furnace.

The outward-projecting part N of the base extends into the side walls ofthe furnace and provides a means for holding the shield in its properposition. No bolts or anchors are used in connecting my device with themasonry of the furnace, and any spreading of the furnace-arch or rackingof the walls is not liable to spring the shield or track out ofposition.

The overhanging shield A is provided with a projecting flange P, abovewhich the shield is to be covered with a mixture of fire-clay orsuitable material to protect it from the The dust arising from stirringthe ores and settling on the shield will soon form a protection from theheat should no other material be placed thereon.

The space between the hearth and the overhanging shield is partiallyfilled with a thin wall of fire-brick R, leaving a space or slotsufficiently wide for the rabble-arm to pass through. This wall and theoverhanging shield protect the track and the machinery run thereon fromthe furnace heat, and the rabble-arm can be drawn back and forth in thefurnace without serious injury to the operating mechanism.

My device is applicable to long roastingfurnaces having one hearth or amultiple of hearths placed one above another.

In Fig. I my device is represented as applied to a two-hearth furnace.The rabblearms are carried on small trucks drawn by chain belts, whichpass in one direction through one furnace and around sprocketwheels atthe end of the furnace and then back into and through the other furnace.The rabble -blades are set to opposite angles on each alternate arm,which constantly shifts the ores back and forth across the hearth untilthey are thoroughly roasted.

Having described my invention, what I claim as new and useful, anddesire to secure by Letters Patent, is

1. In an ore-roasting furnace,- the combination with theroasting'hearth, and an ore-stirring device, of a support for theore-stirring device, said support consisting of an upright portionhaving at its lower part an inwardlyextending base and at its upper partan inwardly extending shield deflecting downwardly at its front, theupright, base and shield being one continuous piece in crosssection, andthe base having means for attachment of a rail for the ore-stirringdevice to rest upon, substantially as described.

2. In an ore-roasting furnace, the combination with the roasting-hearthand an ore-stirring device, of a support for the ore-stirring device,said support consisting of an upright portion having at its lower partan inwardlyextending base and at its upper part an inwardly extendingshield deflected downwardly at its front, the upright, base and shieldbeing one continuous piece in crosssection, and a rail-chair formedintegrally with the base and being slotted to permit the lateraladjustment of a rail thereon, substantially as described.

3. In an ore-roasting furnace, the combination with the roasting-hearth,and an ore-stirring device, of a support for the ore-stirring device,said support consisting of an upright portion having at its lower partan inwardlyextending base and at its upper part an inwardly extendingshield deflected downwardly at its front, the upright, base and shieldbeing one continuous piece in crosssection, and a rail-chair formedintegrally with the base, substantially as described.

4:. In an ore-roasting furnace, the combination with theroasting-hearth, and an ore-stirring device, of a support for theore-stirring device, said support consisting of an upright portionhaving at its lower part an inwardly extending base and at its upperpart an inwardly extending shield deflected downwardly at its front, theupright, base and shield being one continuous piece in crosssection, andthe upright portion having observation-openings formed therein,substantially as described.

5. In an ore-roasting furnace, the combination with the roasting-hearth, and an ore-stirring device, of a support for the ore-stirringdevice, said support consisting of an upright portion having at itslower part an inwardly extending base and rearwardly-extending flangeand at its upper part an inwardly-extending shield deflected downwardlyat its front, the upright, base and shield being one continuous piece incross-section, and a rail supported uponsaid base, substantially asdescribed.

6. In an ore-roasting furnace, the combination with the roasting-hearth,and an ore-stir ring device, of a support for the ore-stirring device,said support consisting of an upright portion having at its lower partan inwardlyextending base and rearwardly extending flange and at itsupper part an inwardly-extending shield, the upright base and shieldbeing one continuous piece in cross-section and the upright portionformed with observation-openings, and a rail-chair formed integrallywith the base, substantially as de scribed.

7. In an ore-roasting furnace, the combination with the roasting-hearth,and an ore-stirring device, of a support for the ore-stirring device,said support consisting of a number of upright portions each having atits lower part an inwardly-extending base and at its upper part aninwardlyextending shield deflecting downwardly at its front, theupright, base and shield being one continuous piece in cross section,said upright portions being placed end to end to form a practicallycontin nous wall, and means for the ore-stirring device to rest upon,substantially as described.

8. In an ore-roastin g furnace, the combination with theroasting-hearth, and an ore-stirring device, of a support for theore-stirring device, said support consisting of an upright portionhaving at its lower part an inwardlyextending base and at its upper partan inwardly extending shield deflecting downwardly at its front, theupright, base and shield being one continuous piece in cross-section, aweb-brace projecting from the rear face of the upright portion, aweb-brace extending from the under face of the overhanging shield andjoining with the inner face of the upright portion, and means for theorestirring device to rest upon, substantially as described.

9. In an ore-roasting furnace, a continuous L-shaped lining along thesides thereof cast in sections, whose ends are joined with interlockinglugs, an overhanging shield extend- In testimony whereof I aifix mysignature ing from the top of said lining, a continuous in the presenceof two witnesses. flange near the edge of said shield, the lining andshield having Web-braces at suitable in- ARTHUR JOHNSON 5 tervals andthe base provided with rail-chairs, Witnesses and means for adj ustablybolting a rail there- W. R. RU ST,

to, substantially as described and shown. E. S. LEMMEi

